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Q.

What are the unit digits of the cube of the numbers 1109, 117, 565, 390?


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a

9, 3, 5, 0

b

9, 4, 5, 0

c

8, 4, 5, 6

d

7, 9, 8, 0 

answer is A.

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Detailed Solution

The numbers 1109, 117, 565, and 390 are provided.
Unit digit of 1109 is equal to 9.
Unit digit of 117 is equal to 7.
Unit digit of 565 is equal to 5.
Unit digit of 390 is equal to 0.
Find the answer by cubing the unit digit.
Cube of 9 is equal to 729.
Cube of 7 is equal to 343.
Cube of 5 is equal to 125.
Cube of 0 is 0.
Hence the required unit digits are 9, 3, 5, 0 respectively.
Therefore, option 1 is correct.
 
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